In order to determine whether you are interested, tell me your facial expression when you hear these terms:

Hexaflexagons; Conway’s Game of Life; magic squares; Penrose tiles.

If you’re smiling, you're in. If you’re puzzled, read on. If you're groaning in irritation, forget it.

The Mathematical Association of America has just released the entire collection of more than 300 of Martin Gardner's columns for Scientific American, all on a single CD.